红背叶中酚酸类成分研究

Phenolic acid derivatives from Alchornea trewioides

为了研究红背叶的化学成分,采用硅胶、ODS、MCI以及Sephadex LH-20等柱色谱方法从红背叶根95%乙醇提取物中分离得到8个酚酸类成分,根据化合物的波谱数据分别鉴定为没食子酸-7-O-β-(6'-O-香草酰基)-葡萄糖苷(1)、没食子酸(2)、没食子酸乙酯(3)、丁香酸(4)、丁香酸葡萄糖苷(5)、3,5-二甲氧基-4-羟基苯甲酸-7-O-β-D-葡萄糖苷(6)、3,4-二甲氧基苯酚-1-O-α-L-鼠李糖-(1→6)-β-D-葡萄糖苷(7)和3,4,5-三甲氧基苯酚-1-O-β-D-(6'-O-没食子酰基)-葡萄糖苷(8)。其中化合物1为新化合物,化合物4～8为首次从山麻杆属植物中分离得到,其余化合物为首次从该植物中分离得到。

To study the chemical constituents of Alchornea trewioides, silica gel column chromatography, Sephadex LH-20, reverse phase ODS column chromatography, MCI and semi-preparative HPLC were used to separate the 95% EtOH extract of the root of Alchornea trewioides. The structures were elucidated on the basis of spectroscopic studies including ESI-TOF-MS, 1H NMR, 13C NMR, HSQC and HMBC. Eight phenolic acids were obtained and identified as 1-O-galloyl-6-O-vanilloyl-β-glucose （1）, gallic acid （2）, ethyl gallate （3）, syringic acid （4）, glucosyringic acid （5）, erigeside C （6）, 3, 4-dimethoxyphenyl-（6＇-O-a-L-rhamnosyl）-β- D-glucopyranoside （7） and 3, 4, 5-trimethoxyphenyl-（6＇-O-galloyl）-O-β-D-glucopyranoside （8）. Among them, compound 1 is a new compound, compounds 4-8 are isolated from the genus Alchornea for the first time, and the others are isolated from the plant for the first time.